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arXiv · 2610.03455

Big Bang Nucleosynthesis Constraint on $B$-mesogenesis

James M. Cline·Jonas Frerick·Sebastian A. Naja·Yong Xu
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Abstract

$B$-mesogenesis is a low-temperature baryogenesis mechanism, that uses $CP$-violation of the $B$ mesons in the standard model to fulfill the Sakharov conditions. It requires a late period of matter domination by a scalar field $Φ$ that decays into $b\bar b$ quarks, reheating the Universe below the QCD phase transition. We investigate the impact of this mechanism on Big Bang Nucleosynthesis, with respect to the reheating temperature $T_{rh}$, and the mass of $Φ$. Injection of hadrons skewing neutron/proton interconversions are the most important effect, followed by neutrino heating from $Φ$ decays. For $M_Φ\lesssim 100\,$GeV, $T_{rh}$ must be $\gtrsim 10\,$MeV.

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James M. Cline, Jonas Frerick, Sebastian A. Naja, Yong Xu. 2026-10-02. Big Bang Nucleosynthesis Constraint on $B$-mesogenesis. https://arxiv.org/abs/2610.03455

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